What should I wear to Changchun in late June and early July?

Liaoning is naturally a little hotter than Changchun, but it's almost the same at the end of June, but I still have a thin long-sleeved coat in case of rainy days at the beginning of June, and two or three short sleeves are also ok, with cropped pants. The temperature is about to check the weather forecast, just search online. It's extremely cold in Changchun this year, but now it rains more than 10 every day anyway.